Question

The mole fraction of a solute in a 1 m aqueous solution is:

• A. 0.177
• B. 0.0177
• C. 0.0344
• D. 1.77

Answer 1

Answer: (B)

1 molal solution means 1 mole of solute dissolved in 1000 g solvent.
Moles of solute = 1
$w_{\text{solvent}}=1000g$
Moles of solvent (water) = $n_{\text{solvent}}=\frac{1000}{18}=55.56$
Mole fraction of solute $=x_{\text{solute}}=\frac{1}{1+\text{55.56}}=0.0177$